Add changelog

diff --git a/doc/build/changelog/unreleased_20/11820.rst b/doc/build/changelog/unreleased_20/11820.rst
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+.. change::
+    :tags: bug, orm, typing
+    :tickets: 11814
+
+    Fixed issue where it was not possible to use ``typing.Literal`` with
+    ``Mapped[]`` on Python 3.8 and 3.9.
+
+